motionDirectionalDiffusivity.C

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-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.
 
    OpenFOAM is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
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    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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#include "motionDirectionalDiffusivity.H"
#include "surfaceInterpolate.H"
#include "zeroGradientFvPatchFields.H"
#include "addToRunTimeSelectionTable.H"
 
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
namespace Foam
{
    defineTypeNameAndDebug(motionDirectionalDiffusivity, 0);
 
    addToRunTimeSelectionTable
    (
        motionDiffusivity,
        motionDirectionalDiffusivity,
        Istream
    );
}
 
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
Foam::motionDirectionalDiffusivity::motionDirectionalDiffusivity
(
    const fvMesh& mesh,
    Istream& mdData
)
:
    motionDiffusivity(mesh),
    diffusivityVector_(mdData)
{}
 
 
// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
 
Foam::motionDirectionalDiffusivity::~motionDirectionalDiffusivity()
{}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
Foam::tmp<Foam::surfaceScalarField>
Foam::motionDirectionalDiffusivity::operator()() const
{
    if (mesh().foundObject<volVectorField>("cellMotionU"))
    {
        const volVectorField& cellMotionU =
            mesh().lookupObject<volVectorField>("cellMotionU");
 
        volVectorField D
        (
            IOobject
            (
                "D",
                mesh().time().name(),
                mesh()
            ),
            diffusivityVector_.y()*vector::one
          + (diffusivityVector_.x() - diffusivityVector_.y())*cellMotionU
           /(mag(cellMotionU) + dimensionedScalar(dimVelocity, small)),
            zeroGradientFvPatchVectorField::typeName
        );
        D.correctBoundaryConditions();
 
        const surfaceVectorField n(mesh().Sf()/mesh().magSf());
 
        return surfaceScalarField::New
        (
            "faceDiffusivity",
            (n & cmptMultiply(fvc::interpolate(D), n))
        );
    }
    else
    {
        return tmp<surfaceScalarField>
        (
            new surfaceScalarField
            (
                IOobject
                (
                    "faceDiffusivity",
                    mesh().time().name(),
                    mesh(),
                    IOobject::NO_READ,
                    IOobject::NO_WRITE
                ),
                mesh(),
                dimensionedScalar(dimless, 1.0)
            )
        );
    }
}
 
 
// ************************************************************************* //